Improvement in sewing-machines



ZSheets-Sheet I.

C. W; BALDWIN. Sewing Machine.

Patented Aprii 28, 1863.

UNITED STATES PATENT OFFICE.

CYRUS V. BALDWIN, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No- 3S,276, dated April 28, 18623.

To all whom it may concern:

Be it known that I, CYRUS W. BALDWIN, of Boston,in the county of Suffolk and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Sewing- .\Iachines; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings and theletters of reference thereon.

The nature of my invention consists in providing the means whereby I can dispensewith the use of the ordinary shuttle andthe consequent necessity ot'rewinding the thread oncotton, while at the same time I produce a regular shuttle-stitch alike upon both sides of the cloth, it being also an elastic stitch. With my improvements I am enabled to run the ma' chine much longer without being obliged to stop its operation to supply it with thread, as an ordinary spool containing two hundred yards can. be used in it, while the ordinary shuttle will not hold more than fifty yards.

A machine constructed with my improvements is very simple, compact, and strong, and much less complicated than the-shuttlemachine, while possessing all its advantages, and much less liable to get out of repair, while its mode of operation can be readily understood by anyone. Its operation is at the same time attended with much less noise-a very desirableimprovement, particularly in a machine adapted to family use.

Myiuvention further comprises a meansfor giving the required motions to the feed bythe I use of the spring-cam feeding device hereinafter described, which is much stronger, and at the same time more simple, and less liable to get out of repair, than any now in use.

In the accompanying drawings, Figure -1 is a bottom view of a sewing-machine constructed according to my invention. Fig.2 is a side view of the same. Fig. 3 is a vertical and longitudinal section of the same. Fig. 4 1s a bot- ,tom view of the spring-feeder hereinafter de scribed. Fig. 5 is a top view of the-bobbiu or spool holder herein described. Figs. 6 and 7 vice, to be'hereinafter described. Fig. 13 isa view of the cam operating the hook.

To enable others skilled in such matters to make and use my invention, I will now describe its construction and operation.

In the drawings, A denotes the table of the machine; B, the standard or goose-neck, and G the driving-shaft, motion being communicated from it to the vibrating lever O by a pulley, D, and connecting-rod E, furnished with a ball-and socket joint, F, as seen in the drawings. The driving-shaft revolves in standards G G, and is provided with a circular head or drum, H, at its front end, which is secured to it. by a tapering bearing, a, and screw b, as in Fig. 3. Attached to the rear side of this circnlar head,H, Fig. l0,is a spring-arm,I,termihating in a segmental rack,j. This springarm I is connected to a stud, 0 on the inner side of the circular head H by a screw, (1, Fig. 9,which passes through the head H and screws into the arm I, thus attaching the stud a to the arm I very securely. A plate-spring, e, is sooured to the inner side of the head H and presses against the corner or projection c of the stud 0 thus pressing the arm 1 toward the center of the head H and against the cam J, which is attached to the standard G of the machine. The circular head H is also provided with the hook K and the guides L, as seen in the drawings. The book K is attached to one end of a short rod or shaft, a which passes through the periphery of the head H, and to the rear end of which rod or shaft is socured a pinion, 1 Figs. 2 and i0, which en gages with the segmental rack j.

In Figs. 1, 2, and 3, M represents a drum or case, made to contain the bobbin-holder Q, the said drum or case being connected to the table A by the arm 0 and stud I, so that it may be turned or withdrawn from under the table, that the empty spool may be taken out anda new or full one substituted. Q is the bobbin or spool holder, lying loosely within the case M, and constructed to contain the the spool of thread, Fi 8, and with two or rnoretholes in its periphery,ff, Fig. 7, for the thread to pass through, thus causing the necessary friction for the under thread. Upon the bobbin holder Q are two projections or spreaders, g g, Figs; 5 and 6, (there being a corre sponding opening in front ofthe drum or case 111,) for the purpose of dividing the threads or sides of the loop, as hereinafter described.

Figs. 11 and 12 represent the cam-feeding device, also represented in Fig. 3. I) is a metallic cylinder or spindle securely attached to the driving-shaft, and provided with a shoul-v der or cam 0, against which bears the projection d, Fig. 3, attached to the springfeeder 0. So as the cam c revolves with the driving-shaft the rough feeder f is pressed up against the cloth or material to be sewed, and lowered again as the cam turns down. Encircling the spindle b is another cam, g, in which is'a slot, It, so as to allow a slightlateral movement upon the spindle 1/. Between the inner surface of the cam g and the outer periphery of the spindle b is a spiral spring,

'11, which presses the cam in one direction from the spindle, while its corresponding movement is regulated by the screw so that the cam can be shortened or lengthened by the turning of the screwj and as this cam g is made to connect directly with the spring-feeder c by means of the fork or clamp k thefeeder must receive a backward and forward movement by i means of the cam g at the same time that it ers upon the bobbin-holder, by which the loop is divided or spread, so that the thread is cari'ied by the hookpartly around the bobbinholder. At this time, by means of the spring arm I, the cam J, and the rackj, the pinion t, which is attached to the hook K by the shaft a is made to revolve, causing abackward movement ofthe hook and allowing the thread to slip off from it, leaving the loop hanging below the bobbin-holder. By the next revolution of the hook, performing of course at the same time the same operation, the former with the needle in its descent, or with other working parts of the machinery.

Having now described myinvention,what I claim, and desire-to secure by Letters Patent,

1. The revolving and reversible hook K, in

combination with the circular head Hand its accompanying devices, for enabling the hook to take and release the loop, constructed and operated substantially as herein described, and for the purposes set forth. 2. The bobbin or spool'holder Q, with the spreaders g g, constructed and operated substantially as herein described, and for the pur poses set forth.

.3. The revolving hook K, constructed and operated as described in my first claim, in combination with the bobbin or spool holder and spreaders, as described in my second claim, the whole constructed and operating as and for the purposes herein described and set forth.

. 4. The adjustable cam g, with the spring t", the screwj, the cylinder b, and the slot h, in connection with, the shait'c, constructed and operating substantially as herein described, for the purposeset forth.

The adjustable cam g, constructed and operating as described in my fourth claim, in combination with the cam or eccentric O, and also with the spring-feeder e and rough feeder f, the whole constructed and operated as herein described, and for the purposes herein set forth. In witness whereof I have hereunto-set my hand.

1 CYRUS \V. BALDWIN.

Witnesses:

HENRY G. DENNY, S. EDWIN IVESON. 

